diff --git a/tools/mcp_oauth.py b/tools/mcp_oauth.py
index 9003f980f..1235e9e40 100644
--- a/tools/mcp_oauth.py
+++ b/tools/mcp_oauth.py
@@ -915,7 +915,7 @@ def _build_client_metadata(cfg: dict) -> "OAuthClientMetadata":
         )
     client_name = cfg.get("client_name", "Hermes Agent")
     scope = cfg.get("scope")
-    redirect_uri = f"http://127.0.0.1:{port}/callback"
+    redirect_uri = cfg.get("redirect_uri") or f"http://127.0.0.1:{port}/callback"
 
     metadata_kwargs: dict[str, Any] = {
         "client_name": client_name,
@@ -942,7 +942,7 @@ def _maybe_preregister_client(
     if not client_id:
         return
     port = cfg["_resolved_port"]
-    redirect_uri = f"http://127.0.0.1:{port}/callback"
+    redirect_uri = cfg.get("redirect_uri") or f"http://127.0.0.1:{port}/callback"
 
     info_dict: dict[str, Any] = {
         "client_id": client_id,